College students can take out new loans each year they're in school, so by the time graduation comes, it's common to have half a dozen, or more, individual loans.
If some of your loans aren't listed, they're probably private (non-federal) loans.
For those, try to find a recent billing statement and/or the original paperwork that you signed.
They also probably haven’t saved for all of the “unexpected events,” which will eventually become debt too.
In other words, the good money habits for staying out of debt and building wealth aren’t there—their behavior hasn’t changed—so it’s extremely likely they will go right back into debt.
Debt consolidation is nothing more than a con because you think you're starting with a clean slate.